Consumable Electrode Plasma Torch with Integrated Sheath Cooling
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Solution Overview
Problem
Transferred-arc plasma torches face challenges with the short lifespan of electrodes due to erosion, leading to complex cooling systems and difficult maintenance, especially in compact designs where additional cooling circuits and frequent disconnections are necessary.
Innovation Solution
A transferred-arc plasma torch with a consumable graphite electrode continuously supplied through automatic advancement and protected by a neutral gas cladding within a cooled sheath, eliminating the need for additional cooling circuits and simplifying maintenance by maintaining continuous gas, cooling fluid, and electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If additional cooling circuits are added to cool the electrode, then electrode lifespan is improved, but device complexity and bulk increase
Solution Approach 1:
The invention extracts the cooling function from a separate additional cooling circuit and integrates it into the existing sheath cooling system. The sheath, which already has internal water circulation for its own cooling, now also cools the electrode by circulating cooling fluid in the annular space between the sheath and the electrode, eliminating the need for separate cooling circuits.
Solution Approach 2:
The invention merges the sheath cooling function and electrode cooling function into a single integrated cooling system. The same cooling fluid circulation system that cools the sheath now also cools the electrode, combining two cooling functions into one unified system, thereby reducing overall device complexity.
2Duration of action of stationary object
If additional cooling circuits are added to cool the electrode, then electrode lifespan is improved, but ease of maintenance deteriorates
Solution Approach 1:
The invention extracts the electrode from a fixed integrated structure and makes it a separable consumable component. The electrode can be independently removed and replaced without affecting the sheath or the cooling circuits, allowing maintenance personnel to replace electrodes quickly without disconnecting cooling connections.
Solution Approach 2:
The invention adopts a consumable electrode approach where the electrode is designed to be replaced rather than repaired. The electrode is made of erodible material (graphite or copper) and is periodically replaced when worn, while the expensive sheath and cooling system remain in place and are not discarded.
3Duration of action of stationary object
If consumable electrode with automatic advancement is used, then electrode lifespan is improved, but device complexity increases
Solution Approach 1:
The invention implements automatic electrode advancement where the electrode feeds itself through the system. The electrode is supplied in coils and automatically unwinds and advances into the working position through its own consumption during operation, eliminating the need for complex manual feeding mechanisms or external automation systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly prolongs electrode lifespan by reducing erosion and simplifies maintenance by allowing electrode replacement without disconnecting cooling and gas circuits, enhancing operational efficiency and reducing bulk and complexity.
Implementation Method 1
a sheath cooled using a cooling fluid and an electrode inserted into said sheath
Implementation Method 2
the arc is established between the torch and another material serving as counter-electrode
Implementation Method 3
To obtain the ionization of a gas at atmospheric pressure, plasma torches are used
Implementation Method 4
the torch comprises gas cladding means ensuring the cladding of said electrode by a neutral and plasmagene gas inside said sheath
Data Source
AI summary
A transferred-arc plasma torch comprising a sheath cooled using a cooling fluid and an electrode inserted in said sheath. The electrode is made of a consumable material and the torch comprises means to supply the electrode with this material so as to offset its erosion.